import React, { Component } from 'react'
import './index.css'

export default class Footer extends Component {
    handleCheckAll = (event) => {
        const {checkAll} = this.props
        checkAll(event.target.checked)
    }
    handleDeleteAll = () => {
        const {deleteAll} = this.props
        deleteAll()
    }
    render() {
        const {todos} = this.props
        const doneCount = todos.reduce((pre,current) => {return pre + (current.done ? 1 : 0)},0)
        const total = todos.length
        return (
            <div className="todo-footer">
                <label>
                <input type="checkbox" onChange={this.handleCheckAll} checked={doneCount === total && total !== 0 ? true : false} />
                </label>
                <span>
                <span>已完成{doneCount}</span> / 全部{total}
                </span>
                <button onClick={this.handleDeleteAll} className="btn btn-danger">清除已完成任务</button>
            </div>
        )
    }
}
